光子学报 ›› 2020, Vol. 49 ›› Issue (10): 1001001-1001001.doi: 10.3788/gzxb20204910.1001001

• 大气与海洋光学 • 上一篇    下一篇

基于视场权重的激光雷达几何因子计算方法

张寅超(), 王琛, 陈和(), 陈思颖, 郭磐   

  1. 北京理工大学 光电学院 光电成像技术与系统教育部重点实验室,北京 100081
  • 收稿日期:2020-04-20 接受日期:2020-05-28 出版日期:2020-10-25 发布日期:2020-10-13
  • 通讯作者: 陈和 E-mail:ychang@bit.edu.cn;shinianshao@bit.edu.cn
  • 作者简介:张寅超(1961—),男,教授,博士,主要研究方向为光电遥感探测技术. Email: ychang@bit.edu.cn
  • 基金资助:
    国家自然科学基金(61505009)

Calculation Method of Lidar Geometric Factor Based on Field of View

Yin-chao ZHANG(), Chen WANG, He CHEN(), Si-ying CHEN, Pan GUO   

  1. Key Laboratory of Photoelectronic Imaging Technology and System,Ministry of Education,School of Optoelectronics,Beijing Institute of Technology,Beijing 100081,China
  • Received:2020-04-20 Accepted:2020-05-28 Online:2020-10-25 Published:2020-10-13
  • Contact: He CHEN E-mail:ychang@bit.edu.cn;shinianshao@bit.edu.cn
  • Supported by:
    National Natural Science Foundation of China(61505009)

摘要:

为了解决传统激光雷达几何因子计算方法存在偏差的问题,通过几何光学推导出望远镜中全视场和半视场的视场函数,通过对均匀发射激光光束区域的视场函数二重积分与激光光束截面积的比值得到几何因子.考虑激光光轴倾斜失调的影响,推导出大气探测同轴激光雷达的几何因子计算公式.根据所提出的计算公式对典型大气探测同轴激光雷达的几何因子进行计算,并与传统方法进行了对比,结果显示最小全重叠距离一致.最后分析了与激发发射相关的激光光束直径、发散角和激光光轴倾斜角对几何因子的影响,结果表明激光发散角的影响比光束直径更大.该方法适用于均匀分布激光发射光束的激光雷达几何因子快速计算,可为激光雷达的光机设计提供参考.

关键词: 激光雷达, 几何因子, 全视场, 大气探测, 同轴

Abstract:

In order to solve the problem of deviation in the calculation method of traditional lidar geometric factors, the full field and half field of view functions in the telescope are derived through geometric optics, and the geometric factor is obtained by the ratio of the double integral of the field of view function of the uniformly emitted laser beam area to the cross-sectional area of the laser beam. Considering the effect of the laser optical axis tilt misalignment, the geometric factor calculation equation for the atmospheric detection coaxial lidar is derived. According to the proposed calculation equation, the geometric factor of the typical atmospheric detection coaxial lidar is calculated and compared with the traditional method result. The result shows that the minimum full overlap distance is consistent. Finally, the effects of laser beam diameter, divergence angle, and laser optical axis tilt angle related to excitation-emission on geometric factors are analyzed. The results show that the influence of the laser divergence angle is greater than that of the beam diameter. The method is suitable for the rapid calculation of the lidar geometric factor of the uniformly distributed laser emission beam and can provide a reference for the design of the lidar.

Key words: Lidar, Geometric factor, Full field of view, Atmospheric detection, Coaxial

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